fetch_service_config.py 文件源码

def fetch_service_name(metadata):
    """Fetch service name from metadata URL."""
    url = metadata + _METADATA_PATH + "/attributes/" + _METADATA_SERVICE_NAME
    headers = {"Metadata-Flavor": "Google"}
    client = urllib3.PoolManager(ca_certs=certifi.where())
    try:
        response = client.request("GET", url, headers=headers)
    except:
        raise FetchError(1,
            "Failed to fetch service name from the metadata server: " + url)
    status_code = response.status

    if status_code != 200:
        message_template = "Fetching service name failed (url {}, status code {})"
        raise FetchError(1, message_template.format(url, status_code))

    name = response.data
    logging.info("Service name: " + name)
    return name

# config_id from metadata is optional. Returns None instead of raising error